Stack for furnaces



Patented Aug. 2, 1881..

W. SWINDELL. STACK FOR FURNACES.

(No Model.)

{MWUAMM F Ens Phonon 5 UNITED STATES PATENT OFFICE.

WILLIAM I SWIN DELL, OF ALLEGHENY, PENNSYLVANIA.

STACK FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 245,098, dated August 2, 1881.

To all whom it may concern:

Be it known that I,W1LL1AM SWINDELL, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Stacks for Fur-- this defect in the construction of the stack.

7 To enable others skilled in the art to make and use my invention, I will now describe its construction and manner of use, referring for that purpose to the accompanying drawings,

in whichv Figure 1 is an elevation, partly in section, of my improved furnace-stack. Fig. 2 is a plan view of the damper. Fig. 3 is a section of the stack.

' Like letters of reference indicate like parts in each.

I build the outer course of the brick-work of the stack a of bricks b, having longitudinal channels 11 on their outer surfaces-that is, the surface which comes next to the sheet-iron casing 0. 1

At the foot of the stack I make a series of holes, 0, in the sheet-iron casing 0, corresponding in position to the channels b in the brickwork, and at the upper end 1 preferably form a series of exit-holes, 0 This construction enables the air to enter the casing and rise and pass out at the top opening, 0 and thus to keep the iron casing cool and prevent the paint from burning ofi'.

The perforation cand 0 may be omitted, if desired.

Another advantage consists in the fact that it also cools the brick-work and keeps it from burning away so rapidly.

Application filed November 26, 1880. (No model.)

I form the damper g with a facing, g, of refractory material, preferably a tile of suitable shape, with dovetailed edges, secured to the iron plate g by means of a circular flange, 9 which is held by bolts g. The tile 9 is first placed upon the ironplateg and then the flange 9 put on and bolted, as shown in Fig. 1. This damper is so arranged relatively to the mouth of the stack that the latter is completely covered by the refractory portion of the former. The metallic back or plate being protected fromthe flame or heat of the stack, will not warp, and thus I secure a perfectly-fitting damper, by means of which I am enabled to regulate the heat and control the operation of the furnace.

I am aware that for the purposes of dispensin g with an interior fire-pot and to prevent the vitiation of the heated air fire-brick stove-linings hare-been formed with air-Hues through them, and also with air-channels in the lining next to the outer casin g, and do not herein claim such subject-matter; but I am not aware that air-channels have heretofore been used next to the outer metallic casings of stacks and like exposed heated surfaces to prevent the burning oft of the protective coating and the subsequent oxidation and destruction-of the casin g by the weather. Therefore What I claim as my invention, and desire to secure by Letters Patent, is

A furnace or similarly-exposed stack, provided with an outer metallic casing covered with a protective coating of paint or like substance, and having a series of air-spaces between the brick-work of the stack and the metallic casing, to prevent the peeling ofl' of the paint and oxidation of the metallic casing, substantially as and for the purpose specified.

In testimony whereof I have hereunto set myhand.

WILLIAM SWINDELL. 

